While it's essential to recognize that not all individuals with narcissistic tendencies will act in the same way, some narcissists may indeed line up another partner or have someone in mind before leaving their current relationship. This behavior is often motivated by a desire for constant attention, admiration, and validation. Narcissists may struggle with feelings of emptiness and may seek new sources of validation to fulfill their ego.
These individuals may engage in what is commonly referred to as "love bombing" or intense idealization of a new partner to quickly establish a new relationship. They may overlap their current relationship with the new one or emotionally distance themselves from their current partner while pursuing the new one.
It is important to note that not all individuals who have another partner lined up before leaving a relationship are narcissists. People's motivations for their actions can vary, and sometimes individuals may move on quickly due to unresolved issues in their current relationship or emotional dissatisfaction.
If you suspect that you or someone you know is dealing with a narcissist or unhealthy relationship dynamics, seeking the guidance of a therapist or counselor can be beneficial in understanding and coping with the situation. They can offer support, advice, and strategies to navigate through challenging relationships.